AnvilUpdateEvent is fired when the inputs (either input stack, or the name) of an anvil are changed. You can listen to this event to add custom anvil recipes.

The event is cancelable.

If the event is canceled, vanilla behavior will not run, and the output will be set to <item:minecraft:air>.

If the event is not canceled, but the output is not empty, it will set the output and not run vanilla behavior.

The event does not have a result.

It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.

ZenScript
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import crafttweaker.api.event.AnvilUpdateEvent;

AnvilUpdateEvent extends Event. That means all methods available in Event are also available in AnvilUpdateEvent

Name	Type	Has Getter	Has Setter
Name left	Type IItemStack	Has Getter true	Has Setter false
Name levelCost	Type int	Has Getter true	Has Setter true
Name koszt materiałowy	Type int	Has Getter true	Has Setter true
Name name	Type string?	Has Getter true	Has Setter false
Name output	Type IItemStack	Has Getter true	Has Setter true
Name player	Type Player?	Has Getter true	Has Setter false
Name right	Type IItemStack	Has Getter true	Has Setter false